VATICAN CITY (AP) — The Vatican is gearing up for the release of Pope Leo XIV’s first encyclical, a document expected to address artificial intelligence and insist on an ethics-based approach to the technology that prioritizes human dignity, social relationships and peace.

Vatican officials said Leo signed the document Friday, 135 years to the day after his namesake, Pope Leo XIII, signed his most important encyclical, “Rerum Novarum,” or Of New Things. That document addressed the rights of workers, the limits of capitalism and the obligations that states and employers owed workers as the Industrial Revolution was under way.

It became the foundation of modern Catholic social thought, and the current pope has already cited it in relation to the AI revolution, which he believes poses the same existential questions that the Industrial Revolution posed over a century ago. The new encyclical is expected to place the AI question in the context of the church’s social teaching, which also covers issues such as labor, justice and peace.

“I think that the Catholic Church in many ways is going to be the adult in the room on some of these debates about how we are going to integrate AI into the rest of our society,” said Meghan Sullivan, a philosophy professor at the University of Notre Dame who directs its ethics institute. “For sure, the pope is going to be one of the most forceful advocates for human dignity in these discussions.”

Just days after his 2025 election, Leo told the cardinals who made him pope that the Catholic Church owed it to the world to offer the “treasury of her social teaching” to confront the challenges posed by AI on “human dignity, justice and labor.”

The American pope, a math major who is known to spend time scrolling on his phone, will likely refer to the issue this weekend, since the Vatican on Sunday marks its social communications day with a message dedicated to the human cost of the AI race. In the message, released earlier this year, Leo warned of the need to preserve real human relationships in the face of chatbot “friends,” human genius in the face of AI-powered music and video, and human reality in the face of generative AI deepfakes.

The public release of the encyclical, expected in coming weeks, will likely become a new flashpoint between the Chicago-born Leo and the Trump administration, which has made the rapid development of AI a matter of vital national economic and security strategy. The U.S. has strongly rejected international regulatory efforts to rein in AI, and domestically, the Trump administration has removed bureaucratic roadblocks slowing its development.

The document was signed as U.S. President Donald Trump wrapped up a visit to China that included AI business. Traveling with Trump on Air Force One were, among others, Elon Musk, whose social media platform X features his AI chatbot Grok, and Nvidia CEO Jensen Huang, who recently secured federal approval to sell H200 AI chips to Chinese buyers.

The Vatican wants its voice and values in the AI debate

Since the AI boom kicked off with ChatGPT’s debut, the technology’s breathtaking capabilities have amazed the world. Tech companies have raced to develop better AI systems even as experts warn of its risks, from existential but far-off threats like rogue AIs running out of control to everyday problems like bias in algorithmic hiring systems.

The United Nations last year adopted a new governance architecture to rein in AI after previous multilateral efforts, including AI summits organized by Britain, South Korea and France resulted only in nonbinding pledges. The EU in 2024 adopted its own Artificial Intelligence Act, applying a risk-based approach to its AI rules.

The Vatican has sought to add its voice to the debate, offering ethical guidelines for the application of AI in sectors from warfare to education and healthcare. The underlying call has been that the technology must be used as a tool to complement, and not replace, human intelligence.

The Vatican has also warned of the environmental impact of the AI race, recalling the “vast amounts of energy and water” needed for AI data centers and computational power.

“There are almost a billion and a half Catholics in the world, so that alone is reason to pay attention,” said Thomas Harmon, theology professor at the University of St. Thomas in Houston. “But beyond the numbers, the Catholic Church has a deep and sophisticated tradition of thinking through what it means to be human.”

The Vatican in 2020 enlisted tech companies to sign onto an AI pledge, known as the Rome Call for AI Ethics, which among other things boiled down some core principles for AI regulation, including inclusiveness, accountability, impartiality and privacy. Microsoft, IBM and Cisco were among the private sector companies that signed on.

In his final years, Pope Francis called for an international treaty to regulate AI, saying the risks of technology lacking human values of compassion, mercy, morality and forgiveness were too great to merely trust in the morality of AI researchers and developers.

He also brought his authority to bear on the Group of Seven, addressing a special session on the perils and promises of AI in 2024. There, Francis said politicians must take the lead in making sure AI remains human-centric, so that decisions about when to use weapons or even less-lethal tools always remain made by humans. He called ultimately for a ban on the use of lethal autonomous weapons, colloquially known as “killer robots.”

Pope Leo is AI-savvy and concerned with peace, truth and human relations

In-house, Leo has warned priests against using AI to write their homilies, but he has also raised his voice on the broader implications of AI on world peace, labor and the very meaning of reality.

For the Augustinian pope, generative AI’s ability to misinform and deceive through deepfake imagery is particularly worrisome, given that the search for truth is a fundamental element of his religious order’s spirituality.

In a June 2025 speech to an AI conference, Leo acknowledged generative AI’s contributions to healthcare and scientific discovery. But he questioned “its possible repercussions on humanity’s openness to truth and beauty, on our distinctive ability to grasp reality.”

Leo, who has emphasized a constant appeal for peace, has also called for monitoring how AI is being used and developed in warfare in the Middle East and Ukraine, where automated weapons systems are using everything from aerial drones and maritime and ground platforms.

“What is happening in Ukraine, in Gaza and the Palestinian territories, in Lebanon and in Iran illustrates the inhuman evolution of the relationship between war and new technologies in a spiral of annihilation,” he said this past week at La Sapienza, Europe’s largest university.

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AP Technology Writer Matt O’Brien contributed from Providence, R.I.

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Nicole Winfield, The Associated Press